Nearly all of the files including main.h are doing so only for OPT_GET
and friends, which are rather unrelated to the main things that main.h
declares.
This currently consists of just a list of autosave files and the
timestamps of the versions available for each file. It'd probably be a
good idea to add more information to this later, such as the original
file path and perhaps a preview of the file?
Closes#781.